Lab 9.2.6 Troubleshooting Using Ping and Telnet

On the routers, enter the global configuration mode and configure the hostname as shown in the chart.. If there are problems doing this, refer to the Configuring Router Passwords lab.. M

Lab 9.2.6 Troubleshooting Using Ping and Telnet

Objective

• Use knowledge of OSI Layers 1, 2 and 3 to diagnose network configuration errors

• Use ping and telnet utilities in testing

Background/Preparation

Cable a network similar to the one in the diagram Any router that meets the interface requirements displayed on the above diagram, such as 800, 1600, 1700, 2500, 2600 routers, or a combination, may be used Please refer to the chart at the end of the lab to correctly identify the interface

Step 1 Configure the routers

a On the routers, enter the global configuration mode and configure the hostname as shown in the chart Then configure the console, virtual terminal, and enable passwords If there are problems doing this, refer to the Configuring Router Passwords lab Next configure the interfaces and routing according to the chart If there are problems doing this, refer to the Configuring Host

Tables lab and the Configuring RIP lab Make sure to copy the running-config to the

startup-config on each router, so the configuration will not be lost if the router is power recycled

Step 2 Configure the hosts with the proper IP address, subnet mask and default gateway

a Test the configuration by pinging all interfaces from each host If the pinging is not successful go

on to Step 3

Step 3 Check the connections

a Review the physical connections on the standard lab setup

b Check all physical devices, cables, and connections

Step 4 Troubleshoot

a Troubleshoot induced network problems

b Use the commands ping and telnet to discover problems

Step 5 List the findings

a Write down the problems as they are encountered

b Write down what was done to correct the problems

c Have the instructor verify that all problems were corrected

1

2

3

4

5

Step 6 Perform the lab again with Team members 1 and 2 switching roles

Upon completion of the previous steps, log off by typing exit and turn the router off.

Erasing and reloading the router

Enter into the privileged EXEC mode by typing enable

If prompted for a password, enter class If “class” does not work, ask the instructor for assistance

Router>enable

At the privileged EXEC mode, enter the command erase startup-config

Router#erase startup-config

The responding line prompt will be:

Erasing the nvram filesystem will remove all files! Continue?

[confirm]

Press Enter to confirm

The response should be:

Erase of nvram: complete

Now at the privileged EXEC mode, enter the command reload

Router(config)#reload

The responding line prompt will be:

System configuration has been modified Save? [yes/no]:

Type n and then press Enter

The responding line prompt will be:

Proceed with reload? [confirm]

Press Enter to confirm

In the first line of the response will be:

Reload requested by console

After the router has reloaded the line prompt will be:

Would you like to enter the initial configuration dialog? [yes/no]:

Type n and then press Enter

The responding line prompt will be:

Press RETURN to get started!

Press Enter

The router is ready for the assigned lab to be performed

Router Interface Summary

Router

Model Interface #1 Ethernet Interface #2 Ethernet Interface #1 Serial Interface #2 Serial Interface #5

800 (806) Ethernet 0 (E0) Ethernet 1 (E1)

1600 Ethernet 0 (E0) Ethernet 1 (E1) Serial 0 (S0) Serial 1 (S1)

1700 FastEthernet 0 (FA0) FastEthernet 1 (FA1) Serial 0 (S0) Serial 1 (S1)

2500 Ethernet 0 (E0) Ethernet 1 (E1) Serial 0 (S0) Serial 1 (S1)

2600 FastEthernet 0/0

(FA0/0) FastEthernet 0/1 (FA0/1) Serial 0/0 (S0/0) Serial 0/1 (S0/1)

In order to find out exactly how the router is configured, look at the interfaces This will identify the type of router

as well as how many interfaces the router has There is no way to effectively list all of the combinations of

configurations for each router class What is provided are the identifiers for the possible combinations of interfaces

in the device This interface chart does not include any other type of interface even though a specific router may contain one An example of this might be an ISDN BRI interface The string in parenthesis is the legal abbreviation that can be used in IOS command to represent the interface